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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Practical Tools for Integration and Analysis in Materials Engineering
Presentation Title Application of Prolate Spheroid Stereology to Microtexture Regions in Ti-6Al-4V
Author(s) Jaylen James, Adam Pilchak, Sushant Jha, Raymundo Arroyave, Eric Payton
On-Site Speaker (Planned) Jaylen James
Abstract Scope The fatigue life of near-alpha titanium alloys in service is a function of dwell time and microstructure. Clusters of alpha phase with similar c-axis orientations, known as micro-textured regions (MTRs), provide a local environment which facilitates initiation and growth of sub-surface cracks. Models exist for prediction of fatigue crack growth rate taking into account both dwell time and microtextured region parameters such as size; however, to date only 2-dimensional measurements have been used as inputs to this inherently 3-dimensional problem. In the present work, the MTR regions are assumed to be in the shape of prolate spheroids and the major and minor axis lengths are measured in cross-section. Then, the 3D size and shape distributions are estimated using the expectation-maximization and the Cruz-Orive spheroid unfolding algorithm. The magnitude of uncertainty in the unfolding results and implications for 2D fatigue life models for Ti-6Al-4V will be discussed.
Proceedings Inclusion? Planned:
Keywords Modeling and Simulation, Mechanical Properties, Computational Materials Science & Engineering


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